A body slides down a frictionless track which ends in a circular loop of diameter D , then minimum h

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3-2.Motion in Plane

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A body slides down a frictionless track which ends in a circular loop of diameter $D$, then the minimum height $h$ of the body in term of $D$ so that it may just complete the loop, is

A

$h = \frac{{5D}}{2}$

B

$h = \frac{{5D}}{4}$

C

$h = \frac{{3D}}{4}$

D

$h = \frac{D}{4}$

Solution

(b)$h = \frac{5}{2}R = \frac{5}{2}\left( {\frac{D}{2}} \right) = \frac{{5D}}{4}$

Standard 11

Physics

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